Tunable Fabry-Perot filter
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United States of America Patent
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Aug 23, 1983
Issued Date -
N/A
app pub date -
Jun 4, 1982
filing date -
Jun 16, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tunable Fabry-Perot filter for transmitting light in the wavelength range from 3-40 microns is disclosed wherein a pair of low index substrates of refractive index less than 2.4 and positioned between an adjustable spacer means have, on their facing sides, a non-metallic coating of refractive index of at least 4.0 and of optical thickness less than one-half the minimum wavelength to be transmitted. Preferred substrates are potassium halides, cesium halides, and zinc selenide, and preferred high index coatings are from the group of lead telluride, bismuth telluride, germanium telluride and germanium.
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